The problem don't happen when we run from VStudio. Just happen in production site.
You can try to upload/download a file in this site:
Enter with the following info:
Upload a file
1. Click menu "Application/Import"
2. Select "Not Classified" in Document Type
3. Click in "..." button to upload file
4. Click in "Ok" button
Download a file
1. Select "Document" tab
2. Browse in tree to "Documents\Recently Access"
3. Select a file in documents list, and with right click popup menu select "CopyOut"